Hi there,
Thanks for writing in! Try replacing a YouTube video with a self hosted background video. To add a background video, edit your page in WordPress and under Slider Settings: Above Masthead Include your video URL(s) in Optional Background Video field. If using multiple sources, separate them using the pipe character (|) and place fallbacks towards the end (i.e. .webm then .mp4 then .ogv).
Let us know how this goes!